Summary of 5.5W – 2 CHANNEL AUDIO AMPLIFIER
This project describes a compact 5.5W two-channel audio amplifier utilizing the LA4445 IC. It operates on a 12V DC supply with a 4-ohm load per channel, delivering 50dB voltage gain and featuring built-in thermal and overvoltage protection. The design emphasizes minimal external components, low pop noise during power transitions, and high ripple rejection for clear audio output.
Parts used in the 5.5W – 2 Channel Audio Amplifier:
- LA4445 IC
- PCB
- 4 Ohm Speaker (per channel)
- 12V DC Power Supply
This project is a 5.5W – 2 Channel Audio Amplifier based on LA4445 IC.
DESCRIPTION
The small 2 Channel amplifier constructed around Sanyos LA4445 IC delivers 5.5Watts +5.5 Watts at 4 ohm load, supply in 12V DC 2Amp, Input impedance 30K.
SPECIFICATIONS
- Dual Channels output : 5.5W
- Minimum External Parts
- Very small pop noise at the time of power supply ON/OFF
- Good ripple rejections
- Small residual noise
- Built-in protectors 1. Thermal Protector 2. Overvoltage Surge Protector
- Standard Audio signal
- Supply 12V DC
- Load : 4 Ohms Speaker on Each Channel
- Voltage Gain : 50DB
- Output 5.5W on each Channel (THD 10%)
- Total harmonic distortion 1% Max @ Po=1W
- Input impedance 30 K-ohms
SCHEMATIC
PARTS LIST
PCB
Source: 5.5W – 2 CHANNEL AUDIO AMPLIFIER
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What is the power output of this amplifier?
The amplifier delivers 5.5 Watts plus 5.5 Watts at a 4 ohm load. -
How much current does the power supply require?
The supply requires 12V DC at 2 Amps. -
Does the circuit include protection features?
Yes, it includes built-in thermal protectors and overvoltage surge protectors. -
What is the input impedance of the device?
The input impedance is 30 K-ohms. -
Can this amplifier handle low residual noise?
Yes, the design ensures small residual noise and very small pop noise at power ON/OFF. -
What is the maximum total harmonic distortion?
The total harmonic distortion is 1% Max at Po=1W. -
What voltage gain does the amplifier provide?
The voltage gain is 50DB.
